comes from impurities in fuels when they are extracted from the Earth
when fuel burns, so does sulfur.
combine with oxygen to make sulfur dioxide, ends up in atmosphere
sulfur dioxide reacts with moisture in clouds to form dilute sulfuric acid (acid rain)
can cause lakes to become acidic, kills trees and damages statues eg limestone
can be removed from chimney flues by wetscrubbing with an alkali:
1) seawater
dissolved in seawater, producing carbon dioxide, water and dissolved sulfate.
2)calcium oxide slurry
slurry is sprayed onto gases and sulfur dioxide reacts with calcium oxide. calcium sulfite (s) waste product is formed.
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